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प्रश्न
Classify the following as physical or chemical changes :
- Cooking of food
- Boiling of water
- Cutting of trees
- D0issolving salt in water
- Digestion of food
- Melting of ice
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उत्तर
- Cooking of food – Chemical change
- Boiling of water – Physical change
- Cutting of trees – Physical change
- Dissolving salt in water – Physical change
- Digestion of food – Chemical change
- Melting of ice- Physical change
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संबंधित प्रश्न
Chemical changes are accompanied by changes in energy.
State whether the following is physical or chemical changes.
Slaking of lime —
Classify the following changes as physical or chemical.
Solve this crossword by using the clues that follow-
Across
1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1 . It is the change that takes place in case of swinging pendulum of a clock. –
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Give four reasons why the burning of a magnesium ribbon in the air is considered a chemical change.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
Give the reason why the following is considered as chemical changes.
A bright light is seen evolved when a strip of magnesium is heated.
A physical change is generally____________.
